Hypodermic syringe.



Patented lJuly 23, I90I.

` C. WITKWSKI. HYPDDEBMIC SYRINGE.

(Appliction med Jan. 17, i901.)

(N0 Model.)

arnnrr tribu.

CHARLES VITKOWSKI, OF BOSTON, MASSACHUSETTS.

HYPODERIVHC SYRINGE.

SPECIFICATION forming part of Letters Patent No. 679,198, dated July 23, 1901.

Application led January 17, 1901. Serial No..43,5 76. (No model.)

To all whom, it may concern.-

Be it known that I, CHARLES WrrKoWsKI, a citizen of the United States, and a resident of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Syringes, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to syringes,and more particularly to hypodermic syringes; and among the objects of the invention are the simplication of the construction of such devices, the attainment of greater efficiency and convenience in the operation thereof, and the removal of certain objectionable features now existing.

The various novel features of my invention will be hereinafter fully described, and particularly pointed out in the following claims.

Figure l represents in elevation a syringe embodying one form of my invention, the view being made on a large scale. Fig. 2 is a longitudinal sectional view thereof, the varions parts being assembled; and Fig. 3 is a sectional detail, on a yet larger scale, of a portion of thesyringe-barrel and the tubular protective guard therefor.

I have herein shown the barrel of the syringe as an open-ended cylinder a, preferably of glass and provided with a piston b and piston-rod h', having a handle h2 of wellknown or usual construction. The inner end of the barrel is in accordance with my invention provided near its extremity with an external annular shoulder to engage an internal annular seat on the tubular metallic protective guard O, and, referring to Figs. 2 and 3, the barrel a is shown herein as provided at one end with an external metal collar a', permanently secured in place, as by insoluble and acid-proof cement, an internal shoulder d2 of the collar supporting the end of the barrel, the collar being externally reduced in diameter beyond the end of the barrel to form an external annular shoulder aigvvhich abuts against an internal annular seat c, formed on the end of the guard O, thereby positioning the barrel, the extremity ax of the collar, which is internally the exact diameter of the barrel, forming a continuation thereof which projects beyond the end of the guard. Longitudinal thrust on the barrel to seat the shoulder a3 on the guard has manifestly no tendency whatever to separate or loosen the"barrel and collar. Heretofore it has been usual to interpose a Washer between an internal flange on the guard and the end of the barrel to make an air-tight joint, the end of the guard abutting against another washer in the head; but the washer in the guardhas been a source of great annoyance and trouble, as it was difficult to replace when worn, it was readily affected by acids, and it afforded a lodgment for dirt. Not only that, but the slightest chip off the glass barrel or any obstruction, such as a grain of solid matter between the end of the barrel and the Washer, absolutely destroyed the tightness ofl the joint and made the syringe Worthless until a newr barrel or Washer was inserted. In my present invention, as Will hereinafter appear, I entirely eliminate this Washer and all its objectionable features as above noted and provide for a tight joint at all times. Herein the guard C, having the nger-pieces cx, is shown as externally threaded at its ends at 3 and 4 to receive thereupon, respectively', the closing-cap c' and the head hX, the piston-rod passing freely through the former, which bears against the outer end of the barrel and presses Ithe shoulder a3 thereof upon its seat, retaining the projecting end ax of the collar in operative position. The usual Washer w is interposed between the end of the barrel and the cap, the length of the barrel being such that it will project slightly beyond the adjacent end of the support O, as in Fig. 2. The head hX, having a longitudinal bore h, is shown as provided with an interiorly-threaded annular flange h' at its inner end to screw upon the threaded part 4c of the guard and to thereby force the continution dx of the barrel, which, it Will beremembered, is the projecting end of the Icollar a', 95

IOO

provide the head with a threaded nipple to he screwed into the threaded socket of the needle-base, a washer being interposed between the cap and the end of the base to make a tight joint, or the nipple has been tapered to enter a correspondingly-tapered socket in the needle-base, forming a tight joint. In the former structure if the Washer is lost or mislaid or if it leaks, as it is very apt to, the syringe is useless and a new washer must be applied, sometimes an impossibility, and at all times causing vexatious delay. In the latter structure the washer is eliminated; but as the needle-base is held on the nipple by friction it often happens that the needle Will pull off from the syringe at most inopportune times.

The construction forming a part of my invention andnow to be described combines the security of the one type referred to with the tight joint of the other, While eliminating the objectionable features of both.

In accordance with my invention the nipple is herein shown as having an externallythreaded base h2 and a tapering tip h3, the

latter entering a correspondinglytapered socket n in the needle-base n, to which the tubular needle n is secured, the larger end of the socket being threaded, as at n2, Fig. 2, to screw upon the part h2 of the nipple. By means of the screw-thread I secure a positive connection or lock between the nipple and the needle-base, so that there is no possibility of accidental removal of the needle; but the tapered end of the nipple fitting tightly into the socket n insures an absolutely airtight joint with the needle-base without the use of any washer whatever.

It will be manifest that a needle-base having a tapered socket can be used with the head herein described,connection being made by frictional contact, so that my syringe can be used therewith as well as with the form of needle-base which I prefer having the positive connection. With the latter the joint can be tightened as much as desired, as screwing the needle-base onto the threaded nipple operates to more firmly force the tapered tip of the nipple into the tapered portion of the socket. l

My invention is not restricted to the precise construction or arrangement herein shown and described, as the same may be varied Without departing from the spirit and scope of the invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a syringe, the barrel, a separable, tubular protective guard therefor, and means to position the barrel in the guard with the inner open end of the barrel projecting beyond the adjacent end of the guard, the proj ecting portion of the barrel having the internal diameter of the main portion thereof and forming a continuation of the barrel.

2. In a syringe, the barrel having an external annular shoulder near one end, and a separable, tubular guard provided at one end with an internal seat, to be engaged by the shoulder, the barrel belowr the shoulder passing through and projecting beyond the end of the guard.

3. In a syringe, a glass barrel having permanently secured thereto a metallic collar forming a continuation thereof and having an external, annular shoulder, and a separable, tubular guard having at one end an internal annular seat, to engage the shoulder, the end of the collar projecting beyond the adjacent end of the guard.

4. In a syringe, the barrel having an external annular shoulder near one end, a separable tubular guard therefor having at one end an internal annular seat for the shoulder, the end of the barrel projecting beyond the end of the guard, and a detachable head for the adjacent end of the guard, to coperate with the projecting end of the barrel, and form an air-tight joint therewith.

5. In a syringe, a glass barrel having a metallic collar permanently secured to one end thereof, and an external, annular shoulder formed in said collar near its end, the portion of the latter beyond the' shoulder forming a continuation of the barrel.

(i. In a syringe, the barrel, a tubular guard therefor, means to position the barrel in the guard with its lower end projecting beyond the adjacent end of the guard, the projecting portion having the internal diameter of the main portion of the barrel, and ahead screwed upon the guard and having a washer to be engaged by the projecting end of the barrel, forming an air-tight joint thereat.

7. In ahypodermic syringe, a glass barrel, a metallic collar surrounding and permanently secured to one end thereof, said collar having an external annular shoulder, and an internal annular shoulder to support the adjacent extremity of the barrel and take u p longitudinal thrust upon the latter, the portion of the collar beyond the internalshoulder having the internal diameter of the barrell and forming a continuation of the latter.

8. In a syringe, the barrel having an external shoulder near one end, a separable tubular guard therefor having at one end an internal annular seat for the shoulder, the end of the barrel projecting beyond the guard, a detachable head for the adjacent end of the guard having a washer to engage and form an air-tight joint with the projecting end of the barrel, means to support the needle on the head, and a detachable cap for the other end of said guard, to close the adjacent end of the barrel and maintain its shoulder on the seat of the guard.

9. In a hypodermic syringe, the guard, a barrel longitudinally positioned therein with its end Vprojecting beyond the adjacent end of the guard, the projecting end having the IOO IIO

internal diameter of the main portion of the In testimony whereof I have signed my beu-rel, a head detaohably connected with the name to this specification in the presence of guard and having a Washer to engage and two subscribing Witnesses.

form an air-tight joint With the projecting CHARLES VITKOWTSKI. 5 end of the barrel, and an external nipple on Witnesses:

said head, having a smooth tapering tip and JOHN C. EDWARDS,

a locking-thread at the base of the tip. AUGUSTA E. DEAN. 

